changed type of date to int64_t.

src/calendar.c

@@ -177,8 +177,8 @@ int main(void)
 {
   int calendar = CALENDAR_STANDARD;
   int nmin;
-  int vdate0, vtime0;
-  int vdate, vtime;
+  int64_t vdate0, vdate;
+  int vtime0, vtime;
   int ijulinc;
   int i, j = 0;
   int year, mon, day, hour, minute, second;

src/stream_gribapi.c

@@ -1798,7 +1798,7 @@ void gribapiDefDateTimeAbs(int editionNumber, grib_handle *gh, int64_t date, int
 }
 
 static
-int gribapiDefDateTimeRel(int editionNumber, grib_handle *gh, int64_t rdate, int rtime, int vdate, int vtime,
+int gribapiDefDateTimeRel(int editionNumber, grib_handle *gh, int64_t rdate, int rtime, int64_t vdate, int vtime,
                           int productDefinitionTemplate, int typeOfGeneratingProcess, int tsteptype, int timeunit, int calendar, int gcinit)
 {
   int status = -1;

src/timebase.c

@@ -204,8 +204,8 @@ void decode_juldaysec(int calendar, int64_t julday, int secofday, int *year, int
 int main(void)
 {
   int nmin;
-  int vdate0, vtime0;
-  int vdate, vtime;
+  int64_t vdate0, vdate;
+  int vtime0, vtime;
   int ijulinc;
   int i, j = 0;
   int year, mon, day, hour, minute, second;